feat: Add Helm chart for Kubernetes deployment (#1)

## Description

Add complete Helm chart for deploying the CV application to Kubernetes. The chart includes all necessary resources for a production-ready deployment with persistent storage and configurable authentication modes.

## Type of Change

- [x] `feat` - New feature (minor version bump)

## Breaking Changes

- [ ] This is a breaking change (major version bump)

**If breaking, describe the migration path:**

## Checklist

- [x] Commit messages follow [Conventional Commits](CONTRIBUTING.md#commit-guidelines)
- [x] Lint passes (`npm run lint`) - N/A for Helm charts
- [x] Build succeeds (`npm run build`) - N/A for Helm charts
- [x] Tests pass (`npm run test:run`) - N/A for Helm charts
- [ ] API documentation updated (if applicable)

## Testing

- `helm lint` passes on the chart
- `helm template test-release helm/cv-app/` renders 214 lines of valid Kubernetes manifests
- Verified all template helpers function correctly
- Tested conditional rendering (persistence enabled/disabled, simple/keycloak auth modes)

## Screenshots (if applicable)

N/A

## Related Issues

Implements the Helm chart design from `docs/plans/2026-02-23-helm-chart-design.md`

Co-authored-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>
Reviewed-on: #1

helm/cv-app/.helmignore

@@ -0,0 +1,17 @@
+# Patterns to ignore when building packages.
+.git/
+.github/
+.vscode/
+.idea/
+
+# Test files
+*_test.go
+tests/
+
+# Documentation
+*.md
+!README.md
+docs/
+
+# CI/CD
+.github/